Key result
The successful slow pathway ablation site was consistently about 13.4 mm from the proximal His-bundle deflection in AVNRT patients, despite marked variability in Koch's triangle dimensions.
Observational (n=218)
The successful slow pathway ablation site in AVNRT is consistently ~13 mm from the proximal His-bundle regardless of Koch's triangle size, suggesting medial ablation for larger triangles and caution in smaller ones to avoid AV block.
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May guide ablation targeting relative to the His bundle in AVNRT; leaves open prospective validation to reduce AV block risk.
Ueng et al. (1996) conducted an observational in AV nodal reentrant tachycardia (n=218). Radiofrequency ablation of the slow pathway was evaluated on Dimension of Koch's triangle (DHis-Os) and distance to successful ablation site (DHis-Ab). The successful slow pathway ablation site was consistently about 13.4 mm from the proximal His-bundle deflection in AVNRT patients, despite marked variability in Koch's triangle dimensions.
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